1. Collaborative Innovation Center of Advanced Functional Composites & School of Physics and Electronic Information, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
2. College of Physics and Energy, Fujian Normal University, Fuzhou, Fujian 350007, P. R. China
3. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, Anhui 230031, P. R. China